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In this Monday, Dec. 31, 2012, photo, a trader works on the floor at the New York Stock Exchange in New York. World markets registered relief Wednesday Jan. 2, 2013 over the U.S. congressional vote to stop hundreds of billions of dollars in automatic tax increases and spending cuts that risked plunging the world's biggest economy into recession. (AP Photo/Seth Wenig)

In this Monday, Dec. 31, 2012, photo, a trader works on the floor at the New York Stock Exchange in New York. World markets registered relief Wednesday Jan. 2, 2013 over the U.S. congressional vote to stop hundreds of billions of dollars in automatic tax increases and spending cuts that risked plunging the world's biggest economy into recession. (AP Photo/Seth Wenig)